Decoupling between Sr-Pb and Nd-Hf isotopes of Mesozoic mafic rocks in the eastern North China Craton: Implication for multi-stage modification of sub-continental lithospheric mantle
文献类型：期刊论文
| 作者 | Guo, Jun; Huang, Xiao-Long; Zhang, Le; Li, Jie ; Zhong, Jun -Wei
|
| 刊名 | LITHOS
 |
| 出版日期 | 2023 |
| 卷号 | 442-443页码:107096 |
| 关键词 | PRESSURE METAMORPHIC ROCKS TRACE-ELEMENT TRANSPORT SUBDUCTED OCEANIC-CRUST DEHYDRATION PROCESSES SHANDONG PROVINCE COMMON PB ICP-MS BENEATH GEOCHEMISTRY DESTRUCTION |
| ISSN号 | 0024-4937 |
| DOI | 10.1016/j.lithos.2023.107096 |
| 英文摘要 | Recycled crustal materials play an important role in modifying chemical composition of the overlying mantle wedge in oceanic and continental subduction channels. It is widely recognized that the eastern North China Craton (NCC) experienced a complex evolutional history in Phanerozoic and may have undergone multi-stage fluid-and/or melt-related metasomatism from the subducted continental blocks and oceanic slabs. However, the nature and origin of metasomatic agents for the sub-continental lithospheric mantle (SCLM) of the eastern NCC remain in debate. Here, we present an integrated study of zircon U-Pb dating, whole-rock trace elements and Sr-Nd-Hf-Pb isotopes for the Zouping gabbroic diorites in the Luxi area in continental interior of the eastern NCC. The Zouping gabbroic diorites were emplaced into Paleozoic-Mesozoic volcanic-sedimentary sequences at 127 +/- 1 Ma. The studied samples geochemically belong to gabbroic diorites and show arc-like trace element patterns with enriched Sr-Nd-Hf-Pb isotopic compositions. Sr-Pb isotopes of the Zouping gabbroic diorites are uncorrelated with Nd-Hf isotopes, denoting a remarkable decoupling between Sr-Pb and Nd-Hf isotopes. Nd-Hf isotopic compositions of the Zouping gabbroic diorites are similar to those of the eclogites in the Dabie-Sulu orogenic belt, suggesting that their mantle source had been metasomatized by felsic melts possibly derived from the UHP metamorphic rocks (i.e., eclogites) in the Dabie-Sulu orogenic belt. Thus, Triassic continental subduction of the Yangtze Block should have arrived beneath the continental interior of the eastern NCC. Furthermore, the Zouping gabbroic diorites have significantly variable Pb isotopic compositions that are correlated with Ba/La and Ba/Th ratios, suggesting the involvement of two types of aqueous fluids with different Pb isotopic compositions in the mantle source. The high 206Pb/204Pb fluid was directly derived from dehydration of the subducted Paleo-Pacific oceanic crust, while the low 206Pb/204Pb aqueous fluid was originated from dehydration of the subducted Yangtze continental crust. Therefore, the SCLM of the eastern NCC should have been successively metasomatized by aqueous fluids released from the subducted Yangtze continental crust in Triassic and Paleo-Pacific oceanic slabs in Jurassic-Cretaceous. These processes not only resulted in various mantle metasomatites with distinct radiogenic isotopic compositions but also weakened the overlying litho -spheric mantle by reducing its viscosity and strength, which should also be regarded as a critical factor for Mesozoic descratonization of the eastern NCC. |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| WOS记录号 | WOS:000949699500001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/80396]  |
| 专题 | 同位素地球化学国家重点实验室 |
| 推荐引用方式 GB/T 7714 | Guo, Jun,Huang, Xiao-Long,Zhang, Le,et al. Decoupling between Sr-Pb and Nd-Hf isotopes of Mesozoic mafic rocks in the eastern North China Craton: Implication for multi-stage modification of sub-continental lithospheric mantle[J]. LITHOS,2023,442-443:107096. |
| APA | Guo, Jun,Huang, Xiao-Long,Zhang, Le,Li, Jie,&Zhong, Jun -Wei.(2023).Decoupling between Sr-Pb and Nd-Hf isotopes of Mesozoic mafic rocks in the eastern North China Craton: Implication for multi-stage modification of sub-continental lithospheric mantle.LITHOS,442-443,107096. |
| MLA | Guo, Jun,et al."Decoupling between Sr-Pb and Nd-Hf isotopes of Mesozoic mafic rocks in the eastern North China Craton: Implication for multi-stage modification of sub-continental lithospheric mantle".LITHOS 442-443(2023):107096. |
入库方式： OAI收割
来源：广州地球化学研究所
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